Vibro-meter.



PATENTED NOV. 6, 1906.

E. MoGARVEY. VIBRO METER.

APPLIOATIOH FILED JUNE 24.1905.

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UNITED srAr sla ENr orsion. v I EDWARD McGARVEY, OF YOUNGSTOWN, OHIOiVIBRO-METER.

Patented Nov. 6, 1906.

Application filodlmi'24. 1905. Serial No. 266,836.

To all wh or nl it may cor wern I Be it 'known that I, Enwaap MOGARVEY,a cltizen of the United States, residirigat Youngstown, in the county"fMahoningand State of Qhio have invented certain new and useful'rovements in Vibro-Meters, of

which the fdllo'wing is a specification, referones being bad therein tothe accompanying drawings, forming part of the specification, in whicFigure '1'is a plan view ofjmy improved vibro-meter, shewing theindicating arm in section Fig; 2 is an end view of the device, showingthe retaining-spring in engagement with the vibratory ribbon. Fig. 3 1sa front elevation of the device shown in 1. Fig.

' 3 'is a detail view showing adjusting mechanism for theindicating-arm. Fig. 4 is a view similarv to Fig. 1, showing a modifiedconstruction. Fig. 5 is a'diagrammatic view illustrati means for imartin vibrations to the rib on'mechanical Figs. G and 7 are similarviews showing tfie rider in varying positions resulting from differentrates of vibration. Fig. 8 shows a disk su ported along one cut-out'edgeand provide with a radially arranged rider.

' My invention refers to improvements in frequency or vibration metersfor indicating directly on a scale the frequency of an alternatingcircuit or the rate of vibration of any active mechanicalelement or forindicating variations in pressure. The principle of the invention isbased on the laws of vibratory motion.

Electricians, and particularly thosein charge of alternating-currentstations, have long recognized the need for an instrument which wouldindicate the frequency ofthe circuit accurately within one alternation.

The'reasons'for this are, first, on account ofthe proper speeding of thegenerator this is essential from the fact that a system'will. work mostsatisfactorily and efiiciently when running at the rate of alternationfor which the system was designed, and more articularly so when thecurrent is supplie to m0- tors and other apparatus having coils whichcomprise an inductive resistance; second,

where A. C. generators are desired to'run in parallel it results in asavin of time to have an instrument which will lndicate the freuencaccurately over a sufiicient range, so

t at t e generators can be brought into steD dependin without resorti nto the slow method connected with sync onizing lamps.

It is a well-recognized fact and fundamental in the first principles ofvibrator I motion that any vibrating element, as a dis or reed, whensupported atone point and v bratedby means of an electromagnet incircuit with a source of alternating or intermittent current ormechanically in any, con-' venient manner, as by means of a violin-bowapplied to its edge, will vibrate at the rate upon its material, size,or dimensions'. upon such a vibrating element sand orother lightmaterial is placed and vi bration imparted to the element, such loosematerial Wlll collect at certain points and will arrange itself intolines or accumulations indicating the nodes or non-vibrating pgints ofquietness. This is due to the tendency of a body vibrating freely uponitself to force any movable object supported thereon from the point ofgreatest movement at the center-of the vibrating zone toward the node orneu- 'tral point at which obtains the least motion.

My invention is designedto utilize this principle in physics and isconstructed and designed to o erate in the manner hereinafter describeand as shownin the accompanying drawings, em loying a longitudinalribbon of steel or ot er suitable metal or other equivalent vibratingelement, as a disk, provided with a movable rider adapted to transmitmotion to an indicating-arm arranged in'proper relation with a suitabledial or to indicate directly upon such a dial-or scale.

Referring to the drawings, 2 indicates theat one end to any ribbon,rigidly secured suitable support, as a post 3, the other end of theribbon being engaged and supported'by any suitableflexible means adaptedto 60- operate with the vibrating ribbon without materially afiectin itsoperation, as springblades 4. These b ades are rigidly secured to anysuitable su port, as a post or abutment 5, and embracet e ribbon at eachside, lightly holding it w1th sufficient necessary resiliv enc fi isa'ma net located adjacent to the rigid support of t e ribbon and insuitable relation therewith, so as to vibrate it at varying rates ofvibration, dependent u on the rate of interruption orcondition of 0W ofthe current. 7 1s a movable element, which I call a gaging a slot 9,formed ng t the rate of vibration as one the varying positions of ther1der u rider, loosely mounted upon the ribbon 2, and which is arrangedto traverse the ribbon longitudinally and to assume a positioncorresponding With' the node of vibration, as indicated in Figs. 6 and7.

In Figs. 1 and 2 I have shown the rider as provided with a projectinglug or pin 8, en-

in an indicating-arm 10, pivoted at 11 and provided with a terminalindicating-point 12, arranged to traverse the arc-shaped dial 13 andto'indicate readings thereon, subject to and dependent upon on theribbon. That portion oft e arm 10 in which the slot 9 is formed isarranged at such an angle to the longitudinal axis of the arm 10 as tocounteract the effect, to a certain exs in movement prov tent, of thedifierence duced rates of vibration caused by that property of vibratingmembers wherein, as

the vibration gets lower in rate and the seg ment consequently longer, agreater movement of the node will occur for the given change in the rateof vibration.

The pivo a ee ng adjnstab le to allow of setting of the pivotal bearingwith relation to the normal position of the rider In 3* I haveillustrated one manner in which the indicating arm 1O may be adjusted,the pivotal bearing 11- extending from a movable block 12 and adaptedto'be .delicately adjusted by means of a threaded screw 13%, mounted in,a suitable threaded bearing 14. If

The ribbon 2 is made of WeightQand thickness that when influenced byrates of vibration imparted to it at one end by suitable means, as anelectromagnet, and ranging between the limits of vibration over wh chtheinstrument is constructed to indicate fi s fu dame t a ll ak a sitionbetween the two end supports. or example, let an alternating currenttraverse the c ils of the magnet having a frequency of the hundred rateof vibration by changing 1n length and forcing the end segment,supported in a yieldin manner, to its rate of vibration. The riiIer,which moves between certain limits, will from the action of the ribbon,move toward the node and will come to rest at the point of leastvibration, and if the scale is suitably graduated and adjusted willindicate hundred and 11 may be either fixed or made a desired, theadjustment may be vertical as well as lateral. such material it willhave a resulting node boundand twenty alternations er secend, the magnetwill force upon the ribbon a twenty per second. a Any change in the rateof alternation in the circuit will produce a corresponding ,change inthe position of the node and a consequent movement of the rider.

The rider is designed to act as a'visual 1nd-icator of the node, and inFig. 4 I have indicated a sim ler construction, wherein the rider 7itsel is provided with an indicatin point 12, arranged to play along andndicate readings upon a dial or scale 13, made of suflicient length toaccommodate the longest range of movement'of the node.

In Fig. 5 the ribbon 2 is shown as connected at 14 with an arm forming aportipn of or connected with a dia hragm 15, with which 1s connected avibrating element 16, adapted to transmit vibrations to the diaphragmfrom any active element, as a shaft, the rate of which it is ,desired tomeasure.

In Fig. 8 the rider 7 is made in the form of an indicatin -hand, looselymounted at the center of a. 'sk 2, cut out in segmental form and suported upon a rigidly-connected abutment. 5y this 'arran ement the nodesassume radial lines, w 1ch will be indicated by the freely-mounted rider7", a su1t able scale 13 being arranged in the path of travel of theindicating-pointer.

Various adaptations of the invention may be made by the skilled mechanicor electri- ,cian. It may be chan ed, varied, or modifled to suitvarious a' aptations of use or local conditions, and I do not desire tobe limited to the exact construction shown and .described, but toinclude within the scope of the claims all such changes and variations.

1. A vibro-meter consisting of a vibrating ,elementprovided with aindicating-rider ,capable of conforming to t e node of vibration of theelement, substantially as set forth.

2. A vibro-meter consisting of a vibrating element provided with anindicating-rider capable of conforming to the node of vibration of theelement, with means for impartvibrations to t e vibratory element,substantially as set for 3. A vibro-meter consisting of a ribbon rigidlysecured at one end and provided with a variable su ing a movab e to thenode of forth.

4. A vibro-meter consisting of a ribbon rigidly secured at one end andprovided with a variable support at the other end, a movable riderarranged to adapt itself to the node of vibration, and means forimparting vibration to the ribbon, substantially as set forth.

5. A vibro-meter consisting of a ribbon rigidly secured at one end andprovided with a variable support at the other end, a movable riderarranged to adapt itself to the node port at the otherend, and hav- IIOof vibration, and an electromagnet located in proximity to the ribbonadjacent to its point of rigid su port, substantially as set forth.

6. A vi ro-meter'com rising a vibrating element rigidly supporte at oneterminal, a movable rider mounted thereon, and an indicating-arm inoperative engagement with said rider, substantially as set forth.

7. A vibro-meter com rising a vibrating element rigidly supporte at oneterminal, a movable rider mounted thereon, and rovided with aprojecting'pin, and an indicatingarm pivoted at one end and providedwith a slot engaging said pin, substantially as set forth. 1 p

8. A vibro-meter com rising a vibrating element rigidly supporte -at oneterminal, a movable rider mounted thereon and provided with a projectingpin, an indicatingarm pivoted at one end and provided with a slotengaging said pin, and an indicating scale arranged in operativerelation with the point of said arm, substantially as set forth.

9. A vibro-meter com rising a vibrating element rigidly supporte at oneterminal, a j

movable rider mounted thereon and provided with a projecting pin, anindicatingarm pivoted at one end and provided with a slot engaging saidpin, and an indicatingscale arranged in operative relation with thepoint of said arm, with means for imparting vibration to the ribbon,forth.

10. A vibro-meter comprising a vibrating element rigidly supported atone terminal,a

movable rider mounted thereon and provided with a projecting pin,an'indicatingarm pivoted at one end and provided with a slot engagingsaid pin, and an indicatingscale arranged in operative relation with thepoint of said arm, with means for imparting vibration-(to '--the ribbon,and means for resiliently supportin the free terminal of the ribbon,substantial y as set forth.

In testimony whereof I afliX my signature in presence of'two witnesses.

EDWARD MGGARVEY. Witnesses: CHAS. S. LEPLEY,

C. M. CLARKE.

substantially as set

